Hey guys what is the sum of 1/2 + 1/4 and no its not 3/4 because its not on the answer sheet.

Solving two-step inequalities worksheet

Can someone me with this problem i don't understand i need

The brain volumes (cm cubed) of 50 brains vary from a low of 904 cm cubed to a high of 1488 cm cubed. use the range rule of thumb to estimate the standard deviation s and compare the result to the exact standard deviation of 175.5 cm cubed, assuming the estimate is accurate if it is within 15 cm cubed